Israeli Navy commandos prevented a terror attack on Monday morning, when a unit of heavily armed Palestinian frogmen was intercepted in the Nahal Aza area.The troops opened fire after calls to stop were ignored, and five terrorists were killed in the ensuing gunfight. No IDF commandos were wounded in the incident.RELATED:Pics of beaten commandos publishedIDF: Future flotillas to be handled differentlyWearing diving gear and apparently trying to swim from Gaza to an Israeli city along the Mediterranean coast, the terrorists were detected by the commandos and a firefight erupted.According to IDF, the size of the unit and equipment it was carrying proved that a large scale attack had been planned, and only the commandos' quick, effective response prevented a disaster.The latest Palestinian attack followed the recent efforts to break the Gaza blockade and bring equipment into Gaza, including construction equipment that could be used for military purposes.